Weird Square in first layer

I’m having this strange problem with my K1. There are some perfectly square areas on the bed where it seems like the printer decides to either move the extruder away or reduce the flow. No matter where I place the parts, the area always stays in the same place. I’ve tried resetting the printer and redoing the leveling mesh, but as you can see, it’s quite acceptable, with differences of 0.16mm. I don’t know what else I can try or what might be causing these problems.

There its nothing strange on my bed. Also i can’t get perfect first layer